关键词: 公路隧道, 衬砌, 空洞, 冻胀力, 力学模型

Abstract:

The problem of frostheaving of water behind highway tunnel lining in cold regions should be solved. As a result, two different simplified calculation models, one model that lining structure is simplified to halfcircular arch with constrained by hinged supports and the other one fixed elastically, are established in case of stripshaped hollows. And then the internal force formulas of lining structure under frostheaving force effect are deduced by loadstructure method; the theoretical values of lining internal force are calculated by MATLAB under different parameters; and the variation curves of lining internal force are drawn. Finally, the distribution laws of lining internal force under different sizes of hollows can be determined. The calculation results show that the peal values of bending moment and axial force of lining induced by frostheaving force place differently, and errors would be exist when considering only bending moment or axial force. Quantitative analysis is carried out on influence of frostheaving force and errors of two simplified modes to provide reference for construction and operation maintenance of highway tunnel.

Key words: highway tunnel, lining, hollow behind lining, frostheaving force, mechanical model